Treatment of montan wax



of Montan wax with than is needed terial, which has not been deresinified. Thus Patented Dec. 3,1929

UNITED STATES miners wfirrnnm runes; or LonwIsmEn-oN-rnE-nntm,

OF MANNEEIM, GERMANY,

AND MICHAEL J'AHRSTORF EB.

GERMANY, A CORPORATION OF GERMANY TREATMENT 01 MONTH WAX No Drawing. Application This inventionrelates to the production improved properties.

We have found that the properties of Montan wax, which has been bleached with oxidizing agents, and its capability for fixing oil of tur entine and other solvents and diluents, suc as are used in the manufacture of shoe creams and the like are considerably improved by treating the crude or pretreated Montan wax,v these initial materials being equivalents for the purpose of the present invention, with a larger amount of oxidizing agents than is needed for completely bleaching the wax. In performing the process it is preferable to free the crude Montan wax from resins prior to bleaching, inasmuch as this operation enables a product with im-- proved fixing properties to be obtained with a smaller expenditure of oxidizing agents in the case of an initial main treating a deresinified wax, for example with from 175 to 200 per cent of chromic acid, having reference to the amount of the deresinified wax, fixing propertiesis obtained, whereas at least 250 per cent of chromic acid would be needed to furnish a product of only approximately the same quality from an initial material which is not deresinified. The color of the product bleached in accordance with the present invention is almost white and is hardly paler than a Montan wax bleached, after deresinification, with 140 per cent of chromic acid, which latter product, however, is far inferior in fixing properties to the former product. Thus for example 1 gram of deresinified Montan wax bleached with 175 per cent of chromic acid is capable oi combinv ing with 80 cubic centimeters of turpentine oil with the formation of a homogeneous jell Y which is not liquid; 1. gram of a deresinifie wax bleached with only 140 per cent of chromicacid, however, can combine only with from 20 to 30 cubic centimeters of turpentine oil to a homogeneous jelly. Accordingly, the fixing property of the former product is higher by about 200 per cent.

The products 0 tained according to the process of this invention are particularly a product with excellent.

filed February 4, 1928, Serial No. 252,037, and in Germany August 19, 1927.

well-ada ted for treatment according to the D process escribed and claimed in the copending appllcation for patent, Ser. No. 245,454: filed January 17, 1928, according to which at least part of the carboxyl groups of the free organic acids present in the bleached Mpntan wax are converted into groups contaming the CO-+- group, but which are free from a carboxyl h drogen atom, for example by converting t e carboxyl groups into ester groups, amide groups, acid anhydr1de groups or into salts, or by converting part of the carboxyl roupsinto ester groups and another part of salts. A product is thus obtained which is almost white in color and has the same excellent fixing qualities for solvents, and which moreover has not the slightest tendency to crystallize, even on storage for a very long time.

The following examples will further illustrate the nature of the said invention which however is not limited thereto.

Example 1 acid. An aqueous solution containing about 95 rams of chromic acid and 400 grams of sul ric acid per litre is added gradually, while stirring, the temperature being raised to about 112 6., such addition being preferably made in stages. The total amount of chromic acid (01:0,) added is 200 kilograms. The bleaching liquor is concentrated, by continuous evaporation of the water, until, after about 5 hours, it has a boiling point of about i18 C. After drawing ofi the spent chromic acid-solution, the bleached Montan wax is treated in the usual manner, as for example by a short extraction with boiling sulfuric acid.

Example 2 1000 kilograms of highly bleached Montan wax obtainable according to the process of Example 1 and having an acid number of about 130 are heated to about 120- C. togather with 85 kilograms oil glycerol, with e carboxyl groups lnto an addition of a small amount of sulfuric acid, say about 0.3 to 0.6 kilo ram of sulfuric acid of'50 per cent strength, or several hours while stirrin the water produced by the e'sterification in evaporated. The esterification proceeds 111 an almost quantitative manner with regard to the glycerol and no excess of the alcohol is re uired. An almost colorless waxis obtaine with hi h fixing properties for oil of turpentine, w 'ch does not crystallize even on storage for a. long time.

Ewamle 3 100 kilograms of highly bleached Montan wax obtainable according to the process of Example 1 are treated together with 4 kilograms of glycol and a small amount of sulfuric acid as described in Example 2. After several hours, when the esterification of the glycol is practically complete, 2.5 kilograms of calcium h droxid are gradually added, the stirring eing continued and a temperature of about 120 C. bein maintained. The composition wax thus 0 tained has a very high melting point, which is even hi her than that of carnauba wax, and is very suitable for the manufacture of boot polishes.

What we claim is: I

1. A process for the production of highly bleached Montan wax with improved properties, which comprises treating Montan wax with a substantially larger amount of oxidizing agents than is needed for completely bleaching the wax.

2. A process for the production of highly bleached Montan wax with improved properties, which comprises treating deresinified Montan wax with from 17 5 to 200 er cent of chromic acid, having reference to t e amount of the deresinified wax.

3. A process for the production of highly bleached Montan wax with improved properties, which comprises treating Montan wax with a substantially larger amount oi oxidizin agents than is needed for completely hleac ing the wax and converting at least part of the carhoxyl oups of the free organic acids present in the product into groups containing the 'CO roup, but which do not contain a carboxyl ydro en atom.

4. As a new article of manu acture an improved highly bleached Montan wax, which is practically white in color and has substantially higher fixing roperties for oil of turpentine and other so vents than a deresinified Montan wax bleached with 140 per cent of chromic acid.

5. As a new article of manufacture an improved hi hly bleached Montan wax, which is practica ly white in color has substantial- 1y higher fixing properties for oil of tu en tine and other solvents than a deresimfied Montan wax bleached with 140 er cent of chromic acid, and which has not t e slightest or oil of turpentine and other solvents ganic acids has been converted partly into a salt and partly into an ester.

In testimony whereof we have hereunto set our hands.

WILHELM PUNGS. MICHAEL J AHRSTORFER. 

